Tread portion of an automobile tire



FIG. 1 is a perspective view of tread portion of an automobile tire according to a first embodiment of my design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5.

In the drawings, the broken lines defining the sidewall, and inner bead depict environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 